The Princess Diaries (2001)
Synopsis: "Impressive performances elevate director Garry Marshall's frothy teen comedy about gawky Mia Thermopolis (Anne Hathaway), a social outcast whose life changes drastically after learning she's the heir to a tiny European principality's throne. But as her royal grandmother (Julie Andrews) schools Mia on the fine points of posture and conducting herself with gracious disdain, she becomes progressively at odds with her best friend (Heather Matarazzo)."
Synopsis compliments of Netflix